What may be the reason for geometrical isomerism?

Restricted rotation about a double bond.

Isomerism exhibited by tartaric acid

Optical isomerism

Isomerism exhibited by maleic & fumaric acid

Geometrical isomerism

Most volatile hydrogen halides

We all are familiar with the different types of hydrogen halides. Do you know which are they? Remember that the different types of hydrogen halides include HF, HBr,HCl & HI. Do you know among these halides which is the most volatile?
Note that the most volatile hydrogen halide is HCl.

What is ammonal?

Remember that ammonal is a mixture of aluminium powder & ammonium nitrate.

Do you know the reason why sodium nitrate is not used in gun powder?

This is becuase it is hygroscopic.

What happens when sodium burns in excess of air?.

Sodium peroxide is formed.

Solubility of AgCl precipitate

I hope chemistry students are familiar with this fact. this is an experiment commonly done in labs. Remember that AgCl precipitate is soluble in ammonium hydroxide solution.

Which is the type of bond seen in HBr molecule?

Polar covalent bond.

Do you know the number of different oxides formed by nitrogen?

I hope chemistry students are familiar with this question. You should know the correct answer as this is an important point.
Remember that the number of different oxides formed by nitrogen is five.

Do you know the reason why there is low solubility of AgCl in water?

• The low solubility of AgCl in water is mainly due to its high lattice energy.

Solubility of lower alcohols

This post is related to the solubility of lower alcohols.
My question is:
Do you know the reason why lower alcohols are readily soluble in water? The answer is that the readily solubility of lower alcohols in water is mainly due to the fact that they form hydrogen bond in water.

The meso form of tartaric acid is neither laevo nor dextro rotatory. why?

This is an important question related to tartaric acid. Do you know the answer? If not, check the below points.
Answer:
Meso form of tartaric acid is neither laevo nor dextro rotatory mainly due to internal compensation.